Hi, I'm creating this post in response to https://community.netgear.com/t5/Orbi-with-Built-in-Cable-Modem/NOTICE-CBR750-and-Comcast-Xfiniity-ISP-Service-Issue/m-p/2286189 I have a CBR750 with 2 satellites. All are on the latest firmware version:Model Name Device Name Current Firmware Version Status RouterCBR750Angelo-CBR750V4.6.14.4No New Firmware AvailableSatelliteRBS750BasementV4.6.14.3No New Firmware AvailableSatelliteRBS750OfficeV4.6.14.3No New Firmware Available On the Xfinity app I can see two different speeds. In one place it shows my plan as 800Mb/s and in another it shows as 1000Mb/s. Through the speed-test in the Orbi app or browser interface I see 1157.27Mb/s download and 17.81Mb/s upload speed. I have around 60 devices connected on my network, most of which are smart home devices (switches, cameras, thermostat) that don't consume constant bandwidth. I have 4-5 active devices at any point in time. Cable diagnostics:Cable DiagnosticStatus: GoodAction: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.Internet Access: Downstream Status: Upstream Status: Refresh Save Cable Diagnostic InfoAdvanced InformationFrequency Start ValueThis field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.Starting Frequency Startup ProcedureProcedureStatusCommentAcquire Downstream Channel519000000 HzLockedConnectivity StateOkOperationalBoot StateOkOperationalSecurityEnabledBPI+IP Provisioning ModeHonor MDDhonorMdd(4)Downstream Bonded ChannelsChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectable1LockedQAM 2561453000000 Hz0.0 dBmV40.9 dB702LockedQAM 2562459000000 Hz-0.2 dBmV40.9 dB003LockedQAM 2563465000000 Hz-0.2 dBmV43.3 dB204LockedQAM 2564471000000 Hz0.0 dBmV43.3 dB705LockedQAM 2565477000000 Hz0.0 dBmV40.9 dB006LockedQAM 2566483000000 Hz0.0 dBmV40.9 dB007LockedQAM 2567489000000 Hz0.0 dBmV40.9 dB008LockedQAM 2568495000000 Hz-0.2 dBmV43.3 dB009LockedQAM 2569501000000 Hz-0.2 dBmV40.3 dB0010LockedQAM 25610507000000 Hz0.0 dBmV40.9 dB0011LockedQAM 25611513000000 Hz0.0 dBmV40.9 dB8012LockedQAM 25612519000000 Hz0.0 dBmV40.9 dB0013LockedQAM 25613525000000 Hz0.0 dBmV43.3 dB0014LockedQAM 25614531000000 Hz0.0 dBmV40.9 dB0015LockedQAM 25615537000000 Hz0.0 dBmV40.3 dB0016LockedQAM 25616543000000 Hz0.0 dBmV40.9 dB0017LockedQAM 25617549000000 Hz0.4 dBmV40.9 dB0018LockedQAM 25618555000000 Hz0.4 dBmV43.3 dB0019LockedQAM 25619561000000 Hz0.5 dBmV40.9 dB0020LockedQAM 25620567000000 Hz0.5 dBmV40.9 dB0021LockedQAM 25621573000000 Hz0.5 dBmV40.9 dB0022LockedQAM 25622579000000 Hz0.5 dBmV40.3 dB0023LockedQAM 25623585000000 Hz0.7 dBmV40.9 dB0024LockedQAM 25624591000000 Hz0.7 dBmV40.3 dB0025LockedQAM 25625597000000 Hz0.5 dBmV40.9 dB0026LockedQAM 25626603000000 Hz1.0 dBmV40.9 dB0027LockedQAM 25627609000000 Hz1.2 dBmV40.9 dB0028LockedQAM 25628615000000 Hz1.4 dBmV40.9 dB0029LockedQAM 25629621000000 Hz1.2 dBmV40.9 dB0030LockedQAM 25630627000000 Hz1.0 dBmV40.9 dB0031LockedQAM 25631633000000 Hz1.2 dBmV40.9 dB0032LockedQAM 25632639000000 Hz1.5 dBmV40.9 dB00Upstream Bonded ChannelsChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower1LockedATDMA45120 Ksym/sec16400000 Hz38.0 dBmV2LockedATDMA35120 Ksym/sec22800000 Hz38.8 dBmV3LockedATDMA25120 Ksym/sec29200000 Hz39.5 dBmV4LockedATDMA15120 Ksym/sec35600000 Hz39.8 dBmV5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmVDownstream OFDM ChannelsChannelLock StatusModulation/Profile IDChannel IDFrequencyPowerSNR/MERActive SubcarrierNumber RangeUnerroredCodewordsCorrectableCodewordsUncorrectableCodewords1Locked3193957000000 Hz-0.4 dBmV42.6 dB148~39470002Not Locked000 Hz0.0 dBmV0.0 dB0~4095000Upstream OFDMA ChannelsChannelLock StatusModulation/Profile IDChannel IDFrequencyPower1Not Locked000 Hz0.0 dBmV2Not Locked000 Hz0.0 dBmV Event Log:TimePriorityDescriptionMay 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:06Warning (5)Lost MDD TimeoutMay 30 2023 15:13:22Notice (6)CM-STATUS message sent. Event Type Code: 24May 30 2023 15:35:41Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 30 2023 15:35:41Notice (6)TLV-11 - unrecognized OIDMay 30 2023 15:35:41Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 30 2023 15:35:45Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 30 2023 15:35:54Alert (2)CM Certificate ErrorMay 30 2023 15:39:18Critical (3)SYNC Timing Synchronization failure - Loss of SyncMay 30 2023 15:39:19Notice (6)CM-STATUS message sent. Event Type Code: 2May 30 2023 15:39:21Critical (3)SYNC Timing Synchronization failure - Loss of SyncMay 30 2023 15:39:21Notice (6)CM-STATUS message sent. Event Type Code: 21May 30 2023 15:39:25Warning (5)Lost MDD TimeoutMay 30 2023 15:39:35Notice (6)CM-STATUS message sent. Event Type Code: 5May 30 2023 15:41:44Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 30 2023 15:41:44Notice (6)TLV-11 - unrecognized OIDMay 30 2023 15:41:44Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 30 2023 15:41:48Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 30 2023 15:41:57Alert (2)CM Certificate ErrorMay 30 2023 15:54:01Notice (6)CM-STATUS message sent. Event Type Code: 5May 31 2023 03:37:29Critical (3)No Ranging Response received - T3 time-outMay 31 2023 11:41:16Notice (6)DS profile config update. DS Chan ID: 193.May 31 2023 11:55:38Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 11:55:38Notice (6)TLV-11 - unrecognized OIDMay 31 2023 11:55:38Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 11:55:42Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 11:55:51Alert (2)CM Certificate ErrorMay 31 2023 12:24:43Critical (3)No Ranging Response received - T3 time-outMay 31 2023 13:26:21Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 13:26:21Notice (6)TLV-11 - unrecognized OIDMay 31 2023 13:26:21Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 13:26:25Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 13:26:34Alert (2)CM Certificate ErrorMay 31 2023 13:34:52Critical (3)No Ranging Response received - T3 time-outMay 31 2023 14:25:33Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 14:25:33Notice (6)TLV-11 - unrecognized OIDMay 31 2023 14:25:33Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 14:25:41Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 14:25:51Alert (2)CM Certificate ErrorMay 31 2023 14:26:27Critical (3)No Ranging Response received - T3 time-out Like many other users, I have to reboot my modem every 2-3 days after the speed slows right down. Xfinity has replaced all the cables in my home but my modem never shows as online on their app. They have re-provisioned the modem multiple times without any luck. Any help in achieving a stable connection would be highly appreciated. I'll be perfectly happy with a stable 800Mb/s rather than an unstable faster connection. Thank in advance.

Ok. Just know that last year CC/XF was said to stop support of 1Gb plan and split into 800Mpbs and 1.2Gb. Found that others with the CBR had issues when the ISP upgraded them to 1.2Gb. NG has been working with the ISP since last year on this. Technically the CBR modem side can handle the 1.2Gb input, but the LAN side won't due to the 1000Mpbs LAN ports. Been recommended if users get 1.2Gb, downgrade to 800Mpbs for the CBR. After your factory reset and setup from scratch this weekend please repost both cable connections and event log pages. I have passed your post thread on to NG for review.

What speed package do you pay for? 800Mbps or 1Gb? Power levels are good. A few odd Correctables but nothing major. Mostly zeros. Any Criticals, Errors or Warnings seen in the modems event logs has to be reviewed by the ISP and resolved by them. How many RBS are deployed? What is the size of your home? Sq Ft?What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR📡 and RBS🛰️ to begin with depending upon building materials when wirelessly connected.https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 🛰️ What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and 40 to 48 channel on 5Ghz.Any Wifi Neighbors near by? If so, how many? Any of the following enabled? Armor, Smart Parental Controls or Circle, Traffic Meter. If so, disable all these. If you haven't factory reset since the FW update, this would be the next step. A complete pull of the power adapters for a period of time after the factory reset then walk thru the setup wizard and setup from scratch with a wired PC and web browser. Recommend setting the default DHCP IP address pool range to the following after applying and a factory reset: 192.168.#.100 to 192.168.#.200.https://kb.netgear.com/24089/How-do-I-specify-the-pool-of-IP-addresses-assigned-by-my-Nighthawk-rout...I would power OFF the ISP modem for 1 minute. Factory reset the Orbi router and power it off. Power ON the ISP modem and let it sync. Then power ON the Orbi router and walk thru the setup wizard again using a wired PC and a web browser.Press the back reset button for 15 seconds then release. https://kb.netgear.com/31486/How-do-I-reset-my-Orbi-system-to-factory-default-settingshttps://kb.netgear.com/000062081/How-do-I-erase-the-configuration-settings-on-my-Orbi-WiFi-System Might reduce the power from 100% to 50% on the RBR for wifi. For that size of home, and two RBS, you could get away with having 1 RBS but for two, i'd reduce the power. Lets do a full on factory reset and setup from scratch. Don't enable Armor. After the reset, give it say 10 minutes, then copy and pastes the cable connections status and event logs page for me again.

I have 2 RBS satellites. The CBR is on the ground level, one satellite is upstairs and the other is down in the basement. Home is around 3400 sq ft over 3 levels. Just curious, how does the WiFi channel impact the WAN performance? It is currently set to auto, but I have previously set this to a manual setting trying to minimize the interference. It didn't resolve the instability on the WAN side. Naturally there are multiple WiFi networks around, but my power levels stand out substantially above neighbors. Armor is currently enabled based on the replacement of the router but it will expire in a day - I don't have an issue manually disabling it as I don't intend paying for it going forward. There's no separate ISP Modem since the CBR750 is a modem/router combo device. I will perform the factory reset and other suggested configs over this weekend as I can't afford the downtime while working from home.

What speed package do you pay for? 800Mbps or 1Gb?

I initially subscribed for 800Mb/s speed from Xfinity. On their app, I see two different values. In one place I see 800Mb/s and in another I see 1000Mb/s. The modem syncs at just under 1200Mb/s download and around 17Mb/s upload.

Forum Discussion

angeloh

Aspirant

Jun 01, 2023

Another CBR750 and Comcast/Xfiniity ISP Service Issue

Hi,

I'm creating this post in response to https://community.netgear.com/t5/Orbi-with-Built-in-Cable-Modem/NOTICE-CBR750-and-Comcast-Xfiniity-ISP-Service-Issue/m-p/2286189

I have a CBR750 with 2 satellites. All are on the latest firmware version:

Model Name Device Name Current Firmware Version Status

Router	CBR750	Angelo-CBR750	V4.6.14.4	No New Firmware Available
Satellite	RBS750	Basement	V4.6.14.3	No New Firmware Available
Satellite	RBS750	Office	V4.6.14.3	No New Firmware Available

On the Xfinity app I can see two different speeds. In one place it shows my plan as 800Mb/s and in another it shows as 1000Mb/s. Through the speed-test in the Orbi app or browser interface I see 1157.27Mb/s download and 17.81Mb/s upload speed. I have around 60 devices connected on my network, most of which are smart home devices (switches, cameras, thermostat) that don't consume constant bandwidth. I have 4-5 active devices at any point in time.

Cable diagnostics:

Cable Diagnostic

Status: Good

Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info.

Internet Access:

Downstream Status:

Upstream Status:

Refresh Save Cable Diagnostic Info

Advanced Information

Frequency Start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	519000000 Hz	Locked
Connectivity State	Ok	Operational
Boot State	Ok	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectable
1	Locked	QAM 256	1	453000000 Hz	0.0 dBmV	40.9 dB	7	0
2	Locked	QAM 256	2	459000000 Hz	-0.2 dBmV	40.9 dB	0	0
3	Locked	QAM 256	3	465000000 Hz	-0.2 dBmV	43.3 dB	2	0
4	Locked	QAM 256	4	471000000 Hz	0.0 dBmV	43.3 dB	7	0
5	Locked	QAM 256	5	477000000 Hz	0.0 dBmV	40.9 dB	0	0
6	Locked	QAM 256	6	483000000 Hz	0.0 dBmV	40.9 dB	0	0
7	Locked	QAM 256	7	489000000 Hz	0.0 dBmV	40.9 dB	0	0
8	Locked	QAM 256	8	495000000 Hz	-0.2 dBmV	43.3 dB	0	0
9	Locked	QAM 256	9	501000000 Hz	-0.2 dBmV	40.3 dB	0	0
10	Locked	QAM 256	10	507000000 Hz	0.0 dBmV	40.9 dB	0	0
11	Locked	QAM 256	11	513000000 Hz	0.0 dBmV	40.9 dB	8	0
12	Locked	QAM 256	12	519000000 Hz	0.0 dBmV	40.9 dB	0	0
13	Locked	QAM 256	13	525000000 Hz	0.0 dBmV	43.3 dB	0	0
14	Locked	QAM 256	14	531000000 Hz	0.0 dBmV	40.9 dB	0	0
15	Locked	QAM 256	15	537000000 Hz	0.0 dBmV	40.3 dB	0	0
16	Locked	QAM 256	16	543000000 Hz	0.0 dBmV	40.9 dB	0	0
17	Locked	QAM 256	17	549000000 Hz	0.4 dBmV	40.9 dB	0	0
18	Locked	QAM 256	18	555000000 Hz	0.4 dBmV	43.3 dB	0	0
19	Locked	QAM 256	19	561000000 Hz	0.5 dBmV	40.9 dB	0	0
20	Locked	QAM 256	20	567000000 Hz	0.5 dBmV	40.9 dB	0	0
21	Locked	QAM 256	21	573000000 Hz	0.5 dBmV	40.9 dB	0	0
22	Locked	QAM 256	22	579000000 Hz	0.5 dBmV	40.3 dB	0	0
23	Locked	QAM 256	23	585000000 Hz	0.7 dBmV	40.9 dB	0	0
24	Locked	QAM 256	24	591000000 Hz	0.7 dBmV	40.3 dB	0	0
25	Locked	QAM 256	25	597000000 Hz	0.5 dBmV	40.9 dB	0	0
26	Locked	QAM 256	26	603000000 Hz	1.0 dBmV	40.9 dB	0	0
27	Locked	QAM 256	27	609000000 Hz	1.2 dBmV	40.9 dB	0	0
28	Locked	QAM 256	28	615000000 Hz	1.4 dBmV	40.9 dB	0	0
29	Locked	QAM 256	29	621000000 Hz	1.2 dBmV	40.9 dB	0	0
30	Locked	QAM 256	30	627000000 Hz	1.0 dBmV	40.9 dB	0	0
31	Locked	QAM 256	31	633000000 Hz	1.2 dBmV	40.9 dB	0	0
32	Locked	QAM 256	32	639000000 Hz	1.5 dBmV	40.9 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	4	5120 Ksym/sec	16400000 Hz	38.0 dBmV
2	Locked	ATDMA	3	5120 Ksym/sec	22800000 Hz	38.8 dBmV
3	Locked	ATDMA	2	5120 Ksym/sec	29200000 Hz	39.5 dBmV
4	Locked	ATDMA	1	5120 Ksym/sec	35600000 Hz	39.8 dBmV
5	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	N/A	Unknown	0 Ksym/sec	0 Hz	0.0 dBmV

Downstream OFDM Channels

Channel	Lock Status	Modulation/Profile ID	Channel ID	Frequency	Power	SNR/MER	Active Subcarrier Number Range	Unerrored Codewords	Correctable Codewords	Uncorrectable Codewords
1	Locked	3	193	957000000 Hz	-0.4 dBmV	42.6 dB	148~3947	0	0	0
2	Not Locked	0	0	0 Hz	0.0 dBmV	0.0 dB	0~4095	0	0	0

Upstream OFDMA Channels

Channel	Lock Status	Modulation/Profile ID	Channel ID	Frequency	Power
1	Not Locked	0	0	0 Hz	0.0 dBmV
2	Not Locked	0	0	0 Hz	0.0 dBmV

Event Log:

TimePriorityDescriptionMay 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:04Notice (6)CM-STATUS message sent. Event Type Code: 17May 30 2023 15:13:06Warning (5)Lost MDD TimeoutMay 30 2023 15:13:22Notice (6)CM-STATUS message sent. Event Type Code: 24May 30 2023 15:35:41Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 30 2023 15:35:41Notice (6)TLV-11 - unrecognized OIDMay 30 2023 15:35:41Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 30 2023 15:35:45Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 30 2023 15:35:54Alert (2)CM Certificate ErrorMay 30 2023 15:39:18Critical (3)SYNC Timing Synchronization failure - Loss of SyncMay 30 2023 15:39:19Notice (6)CM-STATUS message sent. Event Type Code: 2May 30 2023 15:39:21Critical (3)SYNC Timing Synchronization failure - Loss of SyncMay 30 2023 15:39:21Notice (6)CM-STATUS message sent. Event Type Code: 21May 30 2023 15:39:25Warning (5)Lost MDD TimeoutMay 30 2023 15:39:35Notice (6)CM-STATUS message sent. Event Type Code: 5May 30 2023 15:41:44Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 30 2023 15:41:44Notice (6)TLV-11 - unrecognized OIDMay 30 2023 15:41:44Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 30 2023 15:41:48Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 30 2023 15:41:57Alert (2)CM Certificate ErrorMay 30 2023 15:54:01Notice (6)CM-STATUS message sent. Event Type Code: 5May 31 2023 03:37:29Critical (3)No Ranging Response received - T3 time-outMay 31 2023 11:41:16Notice (6)DS profile config update. DS Chan ID: 193.May 31 2023 11:55:38Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 11:55:38Notice (6)TLV-11 - unrecognized OIDMay 31 2023 11:55:38Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 11:55:42Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 11:55:51Alert (2)CM Certificate ErrorMay 31 2023 12:24:43Critical (3)No Ranging Response received - T3 time-outMay 31 2023 13:26:21Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 13:26:21Notice (6)TLV-11 - unrecognized OIDMay 31 2023 13:26:21Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 13:26:25Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 13:26:34Alert (2)CM Certificate ErrorMay 31 2023 13:34:52Critical (3)No Ranging Response received - T3 time-outMay 31 2023 14:25:33Warning (5)MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1May 31 2023 14:25:33Notice (6)TLV-11 - unrecognized OIDMay 31 2023 14:25:33Critical (3)Config File Rejected due to Invalid or Unexpected TLV 11May 31 2023 14:25:41Warning (5)RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRWMay 31 2023 14:25:51Alert (2)CM Certificate ErrorMay 31 2023 14:26:27Critical (3)No Ranging Response received - T3 time-out

Like many other users, I have to reboot my modem every 2-3 days after the speed slows right down. Xfinity has replaced all the cables in my home but my modem never shows as online on their app. They have re-provisioned the modem multiple times without any luck.

Any help in achieving a stable connection would be highly appreciated. I'll be perfectly happy with a stable 800Mb/s rather than an unstable faster connection.

Thank in advance.

Troubleshooting

14 Replies

Replies have been turned off for this discussion

FURRYe38
Guru
Jun 02, 2023
What speed package do you pay for? 800Mbps or 1Gb?

Power levels are good. A few odd Correctables but nothing major. Mostly zeros. Any Criticals, Errors or Warnings seen in the modems event logs has to be reviewed by the ISP and resolved by them.

How many RBS are deployed?
What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR📡 and RBS🛰️ to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite ‌‌🛰️

What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and 40 to 48 channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?

Any of the following enabled? Armor, Smart Parental Controls or Circle, Traffic Meter. If so, disable all these.

If you haven't factory reset since the FW update, this would be the next step. A complete pull of the power adapters for a period of time after the factory reset then walk thru the setup wizard and setup from scratch with a wired PC and web browser. Recommend setting the default DHCP IP address pool range to the following after applying and a factory reset: 192.168.#.100 to 192.168.#.200.
https://kb.netgear.com/24089/How-do-I-specify-the-pool-of-IP-addresses-assigned-by-my-Nighthawk-rout...
I would power OFF the ISP modem for 1 minute. Factory reset the Orbi router and power it off. Power ON the ISP modem and let it sync. Then power ON the Orbi router and walk thru the setup wizard again using a wired PC and a web browser.
Press the back reset button for 15 seconds then release.
https://kb.netgear.com/31486/How-do-I-reset-my-Orbi-system-to-factory-default-settings
https://kb.netgear.com/000062081/How-do-I-erase-the-configuration-settings-on-my-Orbi-WiFi-System

Might reduce the power from 100% to 50% on the RBR for wifi. For that size of home, and two RBS, you could get away with having 1 RBS but for two, i'd reduce the power.

Lets do a full on factory reset and setup from scratch. Don't enable Armor.

After the reset, give it say 10 minutes, then copy and pastes the cable connections status and event logs page for me again.
- angeloh
  Aspirant
  Jun 02, 2023
  I have 2 RBS satellites. The CBR is on the ground level, one satellite is upstairs and the other is down in the basement. Home is around 3400 sq ft over 3 levels.
  
  Just curious, how does the WiFi channel impact the WAN performance? It is currently set to auto, but I have previously set this to a manual setting trying to minimize the interference. It didn't resolve the instability on the WAN side. Naturally there are multiple WiFi networks around, but my power levels stand out substantially above neighbors. Armor is currently enabled based on the replacement of the router but it will expire in a day - I don't have an issue manually disabling it as I don't intend paying for it going forward. There's no separate ISP Modem since the CBR750 is a modem/router combo device.
  
  I will perform the factory reset and other suggested configs over this weekend as I can't afford the downtime while working from home.
  - FURRYe38
    Guru
    Jun 02, 2023
    What speed package do you pay for? 800Mbps or 1Gb?
FURRYe38
Guru
Jun 04, 2023
Ya, the CBR really should be synced at 800 and no more than 1Gb.

Connections page looks good. Minor Correctables on 1st channel but nothing to impact anything.

Keep on them.
- angeloh
  Aspirant
  Jun 08, 2023
  So I had an Xfinity technician out at my place on Sunday - he did find one unused customer cable from a neighboring property was causing distortion so he capped that off. He feels that may be the reason for the correctibles on some of the channels. For other Xfinity clients viewing this I had to go through their "Update Plan" wizard to re-configure the speed of my connection to 800Mb/s. What he told me is that I was on an older plan (I selected this plan 18 months ago when I moved into this house) so I had to "upgrade" my plan to their latest plan definition even though I was actually seeking to ensure that I was configured for 800 Mb/s and nothing higher. This ended up costing me around $10/month more for exactly the same services I had on my existing plan...
  
  I'm travelling out of town this week, so haven't been able to confirm whether all of these changes have resulted in stability. My wife did experience an outage on Tuesday and I had to talk her through rebooting the router. I can't tell right now if it was the same issue or something different as I can't see the logs. I will keep monitoring for the next week or so, as the speed slowdown and the need to reboot usually presents itself between every two or three days.
  
  The Xfinity technician did share that they recently introduced what he called mid-split on the network to improve the speed upstream speeds. My modem only syncs to 4 upstream channels. He said he would follow up internally about the status between Xfinity and Netgear to ensure that they have a valid boot file supporting these additional channels on the network. This is an interim step towards DOCSIS 4 roll-out, which be able to provide symmetrical download and upload speeds via cable, similar to fiber.
  - FURRYe38
    Guru
    Jun 09, 2023
    Thanks for the update and details. Good to know the tech is on it.
    
    Ya seems be changes happening at the ISP and with NG. Hopefully the tech was able to fix the issue.
    
    Let us know how it turns out when you get back.
    
    Have a great weekend.